Boiler-alarm.



D. W. PATTERSON.

BOILER ALARM.

APPLlCATlON FILED AUG. 19. 1914.

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BOILER-ALARM.

Specification of Letters Patent.

Patented July I1, 1916..

Application filed August 19, 1914. Serial No. 857,539.

To all whom it may concern.

Be it known that I, DUNCAN WV. PATTER- soN, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have 1nvented certain new and useful Improve ments in Boiler-Alarms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of this invention is to provide a high and low water alarm for boilers capable of withstanding the high pressures now generally used, and which will contain no floats or hollow bodies likely to be impaired by such pressures.

In the accompanying drawing the figure is an isometrical perspective view, the water column being shown in section.

Referring to the drawings, 1 designates a water column or casing which may be of any preferred form of construction and which is connected at its upper and lower ends with the steam and water spaces of a boiler. In the top of this casing I have shown a steam whistle 2 which is designed to be controlled by a single valve 3 which I have shown as mounted at its lower end on one of two levers 4 whose fulcrum rod 5 is mounted in bearings depending from the top of the water column.

Within the water column I locate two weighted bodies 6 and 7, preferably formed of solid material. The lower weight 6 is connected by a hanging rod 8 to one end of one of the levers 4, and by a second hanging rod 9 to the opposite end of the other lever .4, while the weight 7 is connected by a hang ing rod 10 to one end of one of the levers and a hanging rod 12 to the opposite end of the other lever.

The normal water level is indicated by the line 00. The upper or lighter of the two bodies is normally within the steam space, while the heavier is submerged in the water. While the weights and dimensions of the respective bodies 6 and 7 may be varied according to conditions, the weight of the upper body must exceed that of the lower one when the latter is submerged. 'When both upper and lower weights are submerged, the weight of the lower one must exceed that of the top one; when neither is submerged, the weight of the lower one .must also exceed that of the top one. It is desirable that the amount by which the lower weight exceeds that of the top one under these two conditions be equal, so that the power operating the whistle valve will be the same when the water level is too high as well as when too low. It follows that these bodies are so pro- .portioned as to their sizes and displacements that when the normal water level is maintained the valve 3 will remain seated, since the upper body 7 weighs more than the lower body when the latter is submerged. Should, however, the water fall to the bottom of the column the lower body will become effective and overbalance the upper body, thus unseating valve 3 and causing the alarm to be given. Likewise if the water should rise so as to submerge the upper body 7 as well as the lower body 6 the latter again becomes efiective to open valve 3.

I claim as my invention:

A boiler alarm comprising a water column designed to be connected with the steam and waterspaces of a boiler, a weighted body designed to be normally beneath the water level in the boiler, a second weighted body normally located above such water level, a pair of levers having a common pivot, connections between the alternate ends of each lever and each body, the actual weight of the first mentioned body being greater than that of the second mentioned body, a whistle, and a single valve therefor connected to the arm of one of said levers having connection with the first mentioned weighted body, such whistle being designed to be controlled by the movement of said weighted bodies.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

DUNCAN W. PATTERSON. lVitnesses FRANCIS P. MALONE, MARIE E. MGCULLOUGI-I.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

